Shift type built-in multi-layer arc-shaped permanent magnet rotor

Abstract

The utility model relates to a built-in multi-layer arc type permanent magnet rotor of displacement type relates to motor technical field, this rotor includes rotor core, be equipped with a plurality of permanent magnet unit on rotor core, each permanent magnet unit surrounds rotor core's axle center symmetry and arranges, permanent magnet unit includes three arc type magnetic steel group, the two ends of three arc type magnetic steel group are outward, and three arc type magnetic steel group is arranged from inside to outside along the radial of rotor core, and the two ends of each arc type magnetic steel group are equipped with air permanent magnet slot, and each arc type magnetic steel group includes a plurality of arc type magnetic steel of different magnetic steel width, and is equipped with the separation iron core between the plurality of arc type magnetic steel, the rotor provided by the utility model can reduce motor noise and torque fluctuation.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, and in particular to a technology for a displacement-type built-in multi-layer arc-shaped permanent magnet rotor. Background Technology

[0002] Built-in permanent magnet synchronous motors have a small effective air gap, resulting in a significant impact from cogging torque. In speed control systems, when the frequency of the motor torque coincides with the mechanical resonant frequency of the stator or rotor, the vibration and noise generated by the cogging torque are significantly amplified, also affecting low-speed performance and positioning accuracy. Furthermore, drawbacks such as a narrow high-speed constant power range and poor reliability make it difficult to meet requirements.

[0003] Cogging torque, also known as reluctance torque, is a fatal flaw in speed control systems used in automated and mechatronic applications. Various methods to reduce motor torque ripple, such as fractional slot, auxiliary slot, auxiliary tooth, skewed slot, skewed pole, closed slot, and magnetized slot wedge methods, each have their advantages and disadvantages, but none are truly effective in eliminating cogging. Skewed slots or skewed poles are the most commonly used methods to reduce torque ripple, but these methods affect the air gap magnetic induction intensity and flat top width of square wave motors. Furthermore, stator skew complicates the manufacturing process and structure, reduces the stator slot area, lowers output power, and increases copper losses. Both skewed slots and skewed poles reduce output power and complicate the motor's manufacturing process and structure, increasing manufacturing costs. Utility Model Content

[0004] In view of the defects existing in the prior art, the technical problem to be solved by this utility model is to provide a displacement-type built-in multi-layer arc-shaped permanent magnet rotor that can reduce motor noise and torque fluctuation.

[0005] To solve the above-mentioned technical problems, this utility model provides a displacement-type built-in multi-layer arc-shaped permanent magnet rotor, including a rotor core, on which multiple permanent magnet units are provided, and each permanent magnet unit is symmetrically arranged around the axis of the rotor core. The permanent magnet unit includes three arc-shaped magnet groups, with both ends of the three arc-shaped magnet groups facing outwards. The three arc-shaped magnet groups are arranged sequentially from the inside to the outside along the radial direction of the rotor core. Each arc-shaped magnet group has an air permanent magnet slot at both ends. Each arc-shaped magnet group includes multiple arc-shaped magnets with different widths, and a separator core is provided between the multiple arc-shaped magnets.

[0006] The displacement-type built-in multi-layer arc-shaped permanent magnet rotor provided by this utility model is equipped with multi-layer arc-shaped magnet groups. The transversely, arc-shaped magnets with different widths are used to form displacement block permanent magnet poles with the rotor core. This creates an asymmetrical displacement of the d-axis, which can reduce the rotor centrifugal force, effectively reduce the torque fluctuation caused by tooth cogging, and make the radial force of the d-axis of the magnetic pole radial center line and the q-axis of the inter-pole center line tend to be balanced. This reduces mechanical vibration, noise and back EMF harmonics, reduces core loss, optimizes the magnetic flux density waveform, and reduces torque fluctuation. Attached Figure Description

[0007] Figure 1 This is a radial cross-sectional schematic diagram of the displacement-type built-in multi-layer arc-shaped permanent magnet rotor according to an embodiment of the present invention. Detailed Implementation

[0008] The embodiments of this utility model are described in further detail below with reference to the accompanying drawings. However, these embodiments are not intended to limit this utility model. Any similar structures or variations thereof that adopt this utility model should be included in the protection scope of this utility model. The commas in this utility model all indicate the relationship between and.

[0009] like Figure 1 As shown, the present invention provides a displacement-type built-in multi-layer arc-shaped permanent magnet rotor, including a rotor core 1, on which a plurality of permanent magnet units are provided, and each permanent magnet unit is symmetrically arranged around the axis of the rotor core. The permanent magnet unit includes three arc-shaped magnet groups 11, with both ends of the three arc-shaped magnet groups 11 facing outwards. The three arc-shaped magnet groups 11 are arranged sequentially from the inside to the outside along the radial direction of the rotor core 1. Each arc-shaped magnet group 11 has an air permanent magnet slot 12 at both ends. Each arc-shaped magnet group 11 includes multiple arc-shaped magnets with different widths, and a separator core is provided between the multiple arc-shaped magnets.

[0010] This embodiment of the invention employs a three-layer radial arc-shaped ferrite magnet with iron core spacing between the magnets to form a magnetic bridge. Air magnetic barriers are set at both ends of the magnets. Laterally, arc-shaped magnets with different widths are used to form a displacement block permanent magnet pole with the rotor iron core, so that the magnetic poles are asymmetrically displaced relative to the d-axis. This reduces the rotor centrifugal force, effectively reduces torque fluctuations caused by tooth cogging, and makes the radial forces of the d-axis of the magnetic pole radial centerline and the q-axis of the inter-pole centerline tend to be balanced, reducing mechanical vibration, noise and back EMF harmonics, reducing iron core losses, optimizing the magnetic flux density waveform, and reducing torque fluctuations.

Claims

1. A shift-type built-in multi-layer arc-shaped permanent magnet rotor, comprising a rotor core, wherein the rotor core is provided with a plurality of permanent magnet units, the permanent magnet units being symmetrically arranged around the axis of the rotor core, characterized in that: The permanent magnet unit includes three arc-shaped magnet groups, with both ends of the three arc-shaped magnet groups facing outwards. The three arc-shaped magnet groups are arranged sequentially from the inside to the outside along the radial direction of the rotor core. Each arc-shaped magnet group has an air permanent magnet slot at both ends. Each arc-shaped magnet group includes multiple arc-shaped magnets with different widths, and a separator core is provided between the multiple arc-shaped magnets.

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